Operator’s manual
Rear disc mowers
with central suspension
KDTC 260 S/W; KDTC 300 S/W; KDTC 340
- 22 -
CAUTION:
DO NOT pull the cutterbar in other way (towards the tractor), because it
will lead to cutterbar’s premature wear or even its damage.
5.7. Operation (mowing)
Dear operator,
If the disc mower is your first experience (you have mowed with 2-drum mower) you need a piece of
essential information:
1. The main advantage of disc mowers is their small power demand – 20% less tractor power, small
moment of inertia and possibility to manufacture mowers with large working width.
2. There is however a certain disadvantage - creased stubble, especially when it comes to lying grass.
Straight grass may be mowed with horizontal adjustment of the mower and then the stubble will be
even but it will not look as attractive as with 2-drum or 4-drum mower, because the knives work
horizontally to the ground and inclined grass bends because of wind blasts. After the grass is mowed
it gets up, which makes an impression of inaccurate mowing (see Fig. 14).
Every mower may leave stripes of uncut grass when it comes to the knives which cut the grass
towards the grass direction. Amount of stripes are 2 stripes for KDTC 260, 300.
It is a normal phenomenon. Practically, it is not possible to achieve such attractive stubble as in 2-
drum mowers, because the knives work horizontally or at an angle of up to 8° to the ground, and
when it comes to 2-drum and 4-drum mowers slantwise through the ground (even 23°).
Despite these ‘disadvantages’, disc mowers are ‘winning farmers’ trust’ and modern technologies
give the opporunity to manufacture very durable mowers (even up to 1000%).
5.7.1.Essential information concerning mowing
Optimum work parameters
1.
Inclination towards the front 4÷5 degrees which stands for 6÷7 cm of mowing height.
2.
Operation speed
≥
10 km/h.
3.
PTO rpm = 950÷1000 rpm. PTO rpm > 1000 may cause stripes of uncut grass between the disc.
4.
Tractor’s rpm (max. moment – economical fuel consumption 1600÷1800 rpm).
High and inclined grass.
5.
Heighten the cutterbar’s inclination to – H = about 4cm.
6.
Operation without cutterbar’s inclination may cause winding of grass on the forming drums.
7.
Speed up to V
≥
12 km/h (the faster – the better)
8.
Do not take turns in the mowed grass.
- Optimum inclination of the cutterbar towards the ground is between 4° to 5°. If the inclination
exceeds 5°, there might be a slight unevenness of the mowed grass. It impairs slightly the quality of
mowing and has an influence on mower’s operation. When the cutterbar is pulled in other way, it
significantly impairs the quality of mowing and in some cases the mower stops mowing. Besides, it
may lead to premature wear or even damage of the slides and cutterbar.
- When the high grass prevails, the first and the second cut should be mowed at the height level - 6-7
cm, but when the grass grows low – at the height level - 5 cm. The last cut should be mowed a little
bit higher – 7 - 7,5 cm above the ground.
- Too high PTO rpm whirl the air, which may cause the inclination of the grass in front of the discs. It
impairs the quality of mowing.
